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Synthetic Iron Oxide Pigments
Synthetic Red Iron Oxide Pigments were first made in a Laboratory
setting by the 18th century. This pigments were given the name Mars Red.
These pigments contained all the properties of their counterparts, i.e.
Natural Iron Oxide Pigments. Form 19th century, the manufacturing of these
synthetic iron oxide pigments started on regular basic. Gradually, the
improvements have been taken place with every production process because
these pigments have properties like durability, permanence etc. In the early
1920, the yellow synthetic iron oxide pigments (Mars Yellow) were produced
for the first time. Vital improvement processes have been taking place along
with its production and still improvement processes are continued. By
modifying the manufacturing processes of Mars Red and Mars Yellow, the
manufacturing process of Brown Iron Oxide Pigments also has been evolved.
Methods of preparation of Synthetic Iron Oxide Pigments
There are various process of manufacturing
synthetic iron oxide pigments are calcining, precipitation, reduction
thermal decomposition of iron compounds.
The common colors of these pigments are orange, red brown and yellow. Basic
chemicals are used for manufacturing of synthetic iron oxide pigments. To
produce synthetic iron oxide pigments, iron salts or iron compounds are
decomposed. By precipitating of iron salts and reducing the organic
compounds by iron, pigments of synthetic iron oxide can be prepared.
Uses of Synthetic Iron Oxide Pigments
These pigments find usage in many industries
like: wood and paper stains, linoleum, oilcloth, paints, mortar, plaster,
bricks, rubber and for other pigment able substances. The range of
applications of synthetic Iron Oxide Pigments is longer than the Natural
Iron Oxide Pigments. But in few specific cases, the uses of Natural Iron
Oxide pigments can not be substituted by the Synthetic iron Oxide Pigments.
Synthetic Vs Natural Iron Oxide Pigments
These days, there is a large variety of Synthetic
Iron Oxide Pigments available in the market. These synthetic pigments are
found in different colors, having superior uniformity, excellent quality and
high purity. But, the Natural Iron Oxide Dyes are most preferred because of
their ample availability and low cost of extraction.
The main difference between Synthetic and Natural Iron Oxide pigments is
based on their purity. The Natural Iron Oxide Pigments contain contaminants
that reduce the working efficiency of these pigments.
These contaminants can be divided into two types. One having of coloring
property and second type of contaminant behave as extender. These
contaminants with coloring property are often magnetite, MnO etc. while the
non-coloring contaminants are often derived from the Natural pigments. These
non-coloring contaminants are used in the industry as fillers, including
talc, calcium carbonates and clays.